EP0924798A1 - Matériau composite structural absorbant les ondes radar et utilisation d'un tel materiau - Google Patents
Matériau composite structural absorbant les ondes radar et utilisation d'un tel materiau Download PDFInfo
- Publication number
- EP0924798A1 EP0924798A1 EP98402984A EP98402984A EP0924798A1 EP 0924798 A1 EP0924798 A1 EP 0924798A1 EP 98402984 A EP98402984 A EP 98402984A EP 98402984 A EP98402984 A EP 98402984A EP 0924798 A1 EP0924798 A1 EP 0924798A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- order
- composite material
- layer
- thickness
- structural composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
Definitions
- the technical sector of the present invention is that of structural composite materials absorbing radar waves.
- One of the possible solutions to reduce possibilities of detecting a battle tank is to use covering or structural materials chests able to significantly reduce reflection of the incident radar wave.
- the object of the present invention is to provide a structural composite material capable of absorbing incident radar radiation.
- the impregnated folds are glass or Nylon® fibers associated with epoxy resins.
- the composite material can have a thickness of the order of 4 to 10 mm.
- the outer layer has a thickness of the order of 1.5 to 4 mm, the intermediate layer a thickness of the order of 0.5 to 2.5 mm and the layer internal thickness of the order of 1.5 to 3.5 mm.
- the material composite has a total thickness of around 6.75 mm, the outer, intermediate and inner layers having the respective thicknesses of 2.75 mm, 1.5 mm and 2.5 mm.
- the particles electrically conductive are carbon grains having a diameter less than 0.1 mm with a proportion less than 10% by mass.
- the invention also relates to a use of this material for the manufacture of walls for armored vehicles endowed with a mechanical resistance resistant to a pressure of the order of 1 ton / cm 2 and providing an attenuation in reflection of radar waves greater than 10 dB.
- such a composite material can be also used for the production of safety boxes easement or protection for armored vehicles.
- the composite material according to the invention offers the advantage of replacing all the composites used on armored vehicles where there is a need for reduction of radar reflectivity is necessary. More radar absorption performance, it has all the mechanical strength characteristics of composites usual used on armored vehicles.
- the material according to the invention can be used in particular to make batch boxes edge, flysheet and all double walls composites for thermal insulation and the evacuation of heat flows, for example at the rear near the exhaust.
- the composite material according to the invention is obtained without modification of the current manufacturing process existing structural composites.
- the concept of the invention is based on the adaptation of a multilayer structure allowing, through the play of internal resonances of the different layers, to obtain significant absorption over several frequency bands. It has therefore been found that a three-layer material offers a satisfactory compromise for obtaining radar absorption performance and mechanical performance.
- an easement chest made with the material according to the invention can be walked on by a man equipped with his package, with a mass of the order of 100 kg, without causing breakage or permanent deformation, which represents a resistance to a pressure of the order of 1 ton per cm 2 .
- the structural composite material 1 is applied to a support 2 formed by the wall of a armored vehicle (not shown).
- the outer layer 3 is made of a material weakly reflecting non-magnetic dielectric radar, low dielectric loss and equipped with real dielectric permittivity on the order of 3. This layer must favor the penetration of the radar wave in structure by impedance matching.
- a layer may consist of Nylon® fibers and a epoxy resin, for example.
- the intermediate layer 4 consists of a non-magnetic dielectric material whose losses dielectrics are more important than those of the layer external 3, with a real dielectric permittivity of around 5.
- the inner layer 5 is made of a material non-magnetic dielectric charged with carbon particles having a high electrical conductivity, and conferring to this material absorption of electromagnetic waves more important than those of the first two layers.
- the actual dielectric permittivity of this layer is more important, of the order of 15 to 20.
- the material 1 is completed in a known manner by a metal layer 6 consisting of an aluminum film on the order of 0.1 mm thick, for example.
- Layers 4 and 5 are composites made at based on epoxy resin and E glass fiber fabric
- the material 1 according to the invention can have a thickness of the order of 4 to 10 mm, advantageously 6.75 mm approximately.
- the outer 3, intermediate 4 and internal 5 may have a thickness of 1.5 to 4 mm, 0.5 to 2.5 mm and 1.5 to 3.5 mm.
- these three layers have thicknesses 2.75 mm, 1.5 mm and 2.5 mm respectively.
Landscapes
- Laminated Bodies (AREA)
- Aerials With Secondary Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
- une couche externe faiblement réflectrice et à faibles pertes ayant une permittivité diélectrique réelle de l'ordre 3, pour favoriser la pénétration des ondes radar incidentes,
- une couche intermédiaire ayant une permittivité diélectrique réelle de l'ordre de 5,
- et une couche interne chargée de particules électriquement conductrices et ayant une permittivité diélectrique réelle importante de l'ordre de 15 à 20.
- la figure 1 est une vue en coupe montrant la disposition des couches du matériau composite selon l'invention, et
- les figures 2 à 4 sont des courbes illustrant la performance d'atténuation des ondes radar de ce matériau composite dans les trois bandes de fréquences précitées.
Claims (8)
- Matériau composite structural (1) apte à absorber des ondes radar de fréquences 8 à 18 GHz, 35 GHz et 94 GHz, caractérisé en ce qu'il comprend au moins trois couches (3,4,5) de matériaux diélectriques non magnétiques obtenues à partir d'un empilement de plis imprégnés :une couche externe (3) faiblement réflectrice et à faibles pertes ayant une permittivité diélectrique réelle de l'ordre de 3, pour favoriser la pénétration des ondes radar incidentes,une couche intermédiaire (4) ayant une permittivité diélectrique réelle de l'ordre de 5, etune couche interne (5) chargée de particules électriquement conductrices et ayant une permittivité diélectrique réelle importante de l'ordre de 15 à 20.
- Matériau composite structural selon la revendication 1, caractérisé en ce que les plis imprégnés sont des fibres de verre ou de Nylon® qui sont associées à des résines époxy.
- Matériau composite structural selon la revendication 2, caractérisé en ce qu'il présente une épaisseur de l'ordre de 4 à 10 mm.
- Matériau composite structural selon la revendication 3, caractérisé en ce que la couche externe (3) présente une épaisseur de l'ordre de 1,5 à 4 mm, la couche intermédiaire (4) une épaisseur de l'ordre de 0,5 à 2,5 mm, et la couche interne (5) une épaisseur de l'ordre de 1,5 à 3,5 mm.
- Matériau composite structural selon la revendication 4, caractérisé en ce qu'il présente une épaisseur de l'ordre de 6,75 mm, les couches externe (3), intermédiaire (4) et interne (5) ayant des épaisseurs respectives de 2,75 mm, 1,5 mm et 2,5 mm.
- Matériau composite structural selon l'une quelconque des revendications précédentes, caractérisé en ce que les particules électriquement conductrices sont des grains de carbone, ayant un diamètre inférieur à 0,1 mm, avec une proportion inférieure à 10 % en masse.
- Utilisation du matériau composite tel que défini par l'une quelconque des revendications précédentes à la fabrication de parois pour véhicules blindés, dotées d'une résistance mécanique résistant à une pression de l'ordre de 1 tonne/cm2 et procurant une atténuation en réflexion des ondes radar supérieure à 10 dB.
- Utilisation selon la revendication 7 pour la réalisation de coffres de servitude ou de protection pour des véhicules blindés.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9715681 | 1997-12-11 | ||
FR9715681A FR2772520B1 (fr) | 1997-12-11 | 1997-12-11 | Materiau composite structural absorbant les ondes radar et utilisation d'un tel materiau |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0924798A1 true EP0924798A1 (fr) | 1999-06-23 |
EP0924798B1 EP0924798B1 (fr) | 2005-01-26 |
Family
ID=9514465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98402984A Expired - Lifetime EP0924798B1 (fr) | 1997-12-11 | 1998-11-30 | Matériau composite structural absorbant les ondes radar et utilisation d'un tel matériau |
Country Status (7)
Country | Link |
---|---|
US (1) | US6111534A (fr) |
EP (1) | EP0924798B1 (fr) |
AT (1) | ATE288139T1 (fr) |
CA (1) | CA2254314C (fr) |
DE (1) | DE69828759T2 (fr) |
ES (1) | ES2232924T3 (fr) |
FR (1) | FR2772520B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1950835A2 (fr) * | 2007-01-26 | 2008-07-30 | Diehl BGT Defence GmbH & Co.KG | Filtre de rayonnement |
CN105383130A (zh) * | 2014-12-15 | 2016-03-09 | 沈阳航空航天大学 | 一种纳米吸波薄膜功能化改性复合材料层压板的方法 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6224982B1 (en) * | 1999-12-21 | 2001-05-01 | Lockhead Martin Corporation | Normal incidence multi-layer elastomeric radar absorber |
DE10004706B4 (de) * | 2000-02-03 | 2005-12-22 | Epcos Ag | Schichtstapel für einen Elektrolyt-Kondensator |
SE523348C2 (sv) * | 2002-08-15 | 2004-04-13 | Totalfoersvarets Forskningsins | Genomsynlig ruta med radarreflekterande egenskaper |
US8689671B2 (en) | 2006-09-29 | 2014-04-08 | Federal-Mogul World Wide, Inc. | Lightweight armor and methods of making |
US7834799B1 (en) | 2008-05-23 | 2010-11-16 | Composite Engineering, Inc. | System and method for fabricating composite laminate structures with co-laminated radar absorbing material |
TWI369943B (en) * | 2009-09-23 | 2012-08-01 | Univ Nat Taiwan | Electromagnetic wave absorption component and electromagnetic wave absorption device |
PE20150113A1 (es) * | 2012-03-30 | 2015-02-19 | Micromag 2000 Sl | Atenuador de radiacion electromagnetica |
US9608321B2 (en) * | 2013-11-11 | 2017-03-28 | Gogo Llc | Radome having localized areas of reduced radio signal attenuation |
US9263800B2 (en) | 2013-12-27 | 2016-02-16 | Toyota Motor Engineering & Manufacturing North America, Inc. | Artificial skin for radar mannequins |
CN104197785A (zh) * | 2014-09-02 | 2014-12-10 | 零八一电子集团四川红轮机械有限公司 | 防弹防爆电磁屏蔽方舱壁板 |
CN104763099B (zh) * | 2015-03-06 | 2017-07-07 | 中国人民解放军国防科学技术大学 | 具有雷达隐身功能的方舱大板及其制备方法 |
EP3481684B1 (fr) * | 2016-07-08 | 2023-12-06 | Dynamic Research, Inc. | Améliorations apportées à un partenaire de collision souple (voiture souple aka) utilisé dans un système destiné à tester des technologies d'évitement de collisions |
CN111516340B (zh) * | 2020-07-03 | 2020-09-22 | 宁波曙翔新材料股份有限公司 | 一种隐身抗毁屏蔽材料及其制备方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1441626A1 (de) * | 1963-03-01 | 1969-03-06 | Csf | Umhuellungen fuer Hoechstfrequenzempfaenger und Hoechstfrequenzsender |
US3568195A (en) * | 1958-12-04 | 1971-03-02 | Ludwig Wesch | Electromagnetic wave attenuating device |
US3631492A (en) * | 1968-10-09 | 1971-12-28 | Kunihiro Suetake | Multilayer wave absorbing wall |
EP0121655A2 (fr) * | 1983-03-01 | 1984-10-17 | Dornier Gmbh | Matériau à fibres |
EP0370421A1 (fr) * | 1988-11-22 | 1990-05-30 | Akzo Kashima Limited | Absorbeur d'ondes électromagnétiques |
EP0420137A2 (fr) * | 1989-09-26 | 1991-04-03 | Hughes Aircraft Company | Structure à deux couches diélectriques d'adaptation pour radomes et lentilles pour grands-angles d'incidence |
GB2257302A (en) * | 1991-06-28 | 1993-01-06 | Grace Nv | Chiral absorber |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3938152A (en) * | 1963-06-03 | 1976-02-10 | Mcdonnell Douglas Corporation | Magnetic absorbers |
US3680107A (en) * | 1967-04-11 | 1972-07-25 | Hans H Meinke | Wide band interference absorber and technique for electromagnetic radiation |
US3737903A (en) * | 1970-07-06 | 1973-06-05 | K Suetake | Extremely thin, wave absorptive wall |
DE3117245A1 (de) * | 1981-04-30 | 1982-11-18 | Bayer Ag, 5090 Leverkusen | Verwendung textiler metallisierter polwaren als mikrowellenabsorber |
KR930011548B1 (ko) * | 1991-08-13 | 1993-12-10 | 한국과학기술연구원 | 적층형 전파흡수체 |
-
1997
- 1997-12-11 FR FR9715681A patent/FR2772520B1/fr not_active Expired - Fee Related
-
1998
- 1998-11-30 EP EP98402984A patent/EP0924798B1/fr not_active Expired - Lifetime
- 1998-11-30 DE DE69828759T patent/DE69828759T2/de not_active Expired - Lifetime
- 1998-11-30 US US09/200,975 patent/US6111534A/en not_active Expired - Fee Related
- 1998-11-30 AT AT98402984T patent/ATE288139T1/de not_active IP Right Cessation
- 1998-11-30 ES ES98402984T patent/ES2232924T3/es not_active Expired - Lifetime
- 1998-12-10 CA CA002254314A patent/CA2254314C/fr not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3568195A (en) * | 1958-12-04 | 1971-03-02 | Ludwig Wesch | Electromagnetic wave attenuating device |
DE1441626A1 (de) * | 1963-03-01 | 1969-03-06 | Csf | Umhuellungen fuer Hoechstfrequenzempfaenger und Hoechstfrequenzsender |
US3631492A (en) * | 1968-10-09 | 1971-12-28 | Kunihiro Suetake | Multilayer wave absorbing wall |
EP0121655A2 (fr) * | 1983-03-01 | 1984-10-17 | Dornier Gmbh | Matériau à fibres |
EP0370421A1 (fr) * | 1988-11-22 | 1990-05-30 | Akzo Kashima Limited | Absorbeur d'ondes électromagnétiques |
EP0420137A2 (fr) * | 1989-09-26 | 1991-04-03 | Hughes Aircraft Company | Structure à deux couches diélectriques d'adaptation pour radomes et lentilles pour grands-angles d'incidence |
GB2257302A (en) * | 1991-06-28 | 1993-01-06 | Grace Nv | Chiral absorber |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1950835A2 (fr) * | 2007-01-26 | 2008-07-30 | Diehl BGT Defence GmbH & Co.KG | Filtre de rayonnement |
EP1950835A3 (fr) * | 2007-01-26 | 2008-09-03 | Diehl BGT Defence GmbH & Co.KG | Filtre de rayonnement |
CN105383130A (zh) * | 2014-12-15 | 2016-03-09 | 沈阳航空航天大学 | 一种纳米吸波薄膜功能化改性复合材料层压板的方法 |
Also Published As
Publication number | Publication date |
---|---|
DE69828759T2 (de) | 2006-05-18 |
US6111534A (en) | 2000-08-29 |
DE69828759D1 (de) | 2005-03-03 |
FR2772520B1 (fr) | 2000-01-14 |
EP0924798B1 (fr) | 2005-01-26 |
CA2254314A1 (fr) | 1999-06-11 |
CA2254314C (fr) | 2006-08-08 |
ATE288139T1 (de) | 2005-02-15 |
FR2772520A1 (fr) | 1999-06-18 |
ES2232924T3 (es) | 2005-06-01 |
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